Use File Permissions To Control Access To Files

Reference: WikiBooks LPI Linux Certification book
What we'll learn in this section:

Reading ls -l output (Understanding Linux file permissions is a good article on the topic)
Reading permissions in octal format (Getting to Know Linux Security: File Permissions makes good reading)
Changing perms with chmod

Quiz

To be taken on Friday, February 29
Objectives (quiz to be posted closer to quiz day):

Be able to describe the permissions on a file or directory given the ls -l output.
Change a file's permissions to a given description.
Describe umask and how it's useful.